TY - JOUR
T1 - The influence of birth order and number of siblings on adolescent body composition
T2 - Evidence from a Brazilian birth cohort study
AU - De Oliveira Meller, Fernanda
AU - Assunção, M. C.F.
AU - Schäfer, A. A.
AU - De Mola, C. L.
AU - Barros, A. J.D.
AU - Dahly, D. L.
AU - Barros, F. C.
N1 - Publisher Copyright:
Copyright © The Authors 2015.
PY - 2015/7/14
Y1 - 2015/7/14
N2 - The aim of this study was to estimate the association between birth order and number of siblings with body composition in adolescents. Data are from a birth cohort study conducted in Pelotas, Brazil. At the age of 18 years, 4563 adolescents were located, of whom 4106 were interviewed (follow-up rate 81·3%). Of these, 3974 had complete data and were thus included in our analysis. The variables used in the analysis were measured during the perinatal period, or at 11, 15 and/or 18 years of age. Body composition at 18 years was collected by air displacement plethysmography (BOD POD®). Crude and adjusted analyses of the association between birth order and number of siblings with body composition were performed using linear regression. All analyses were stratified by the adolescent sex. The means of BMI, fat mass index and fat-free mass index among adolescents were 23·4 (SD 4·5)kg/m2, 6·1 (SD 3·9)kg/m2 and 17·3 (SD 2·5)kg/m2, respectively. In adjusted models, the total siblings remained inversely associated with fat mass index (β=-0·37 z-scores, 95% CI -0·52, -0·23) and BMI in boys (β=-0·39 z-scores, 95% CI -0·55, -0·22). Fat-free mass index was related to the total siblings in girls (β=0·06 z-scores, 95% CI -0·04, 0·17). This research has found that number of total siblings, and not birth order, is related to the fat mass index, fat-free mass index and BMI in adolescents. It suggests the need for early prevention of obesity or fat mass accumulation in only children.
AB - The aim of this study was to estimate the association between birth order and number of siblings with body composition in adolescents. Data are from a birth cohort study conducted in Pelotas, Brazil. At the age of 18 years, 4563 adolescents were located, of whom 4106 were interviewed (follow-up rate 81·3%). Of these, 3974 had complete data and were thus included in our analysis. The variables used in the analysis were measured during the perinatal period, or at 11, 15 and/or 18 years of age. Body composition at 18 years was collected by air displacement plethysmography (BOD POD®). Crude and adjusted analyses of the association between birth order and number of siblings with body composition were performed using linear regression. All analyses were stratified by the adolescent sex. The means of BMI, fat mass index and fat-free mass index among adolescents were 23·4 (SD 4·5)kg/m2, 6·1 (SD 3·9)kg/m2 and 17·3 (SD 2·5)kg/m2, respectively. In adjusted models, the total siblings remained inversely associated with fat mass index (β=-0·37 z-scores, 95% CI -0·52, -0·23) and BMI in boys (β=-0·39 z-scores, 95% CI -0·55, -0·22). Fat-free mass index was related to the total siblings in girls (β=0·06 z-scores, 95% CI -0·04, 0·17). This research has found that number of total siblings, and not birth order, is related to the fat mass index, fat-free mass index and BMI in adolescents. It suggests the need for early prevention of obesity or fat mass accumulation in only children.
KW - Adolescents
KW - Birth order
KW - Body composition
KW - Cohort studies
KW - Siblings
UR - http://www.scopus.com/inward/record.url?scp=84937633538&partnerID=8YFLogxK
U2 - 10.1017/S0007114515001488
DO - 10.1017/S0007114515001488
M3 - Artículo
C2 - 26074279
AN - SCOPUS:84937633538
SN - 0007-1145
VL - 114
SP - 118
EP - 125
JO - British Journal of Nutrition
JF - British Journal of Nutrition
IS - 1
ER -